Cells, tissues, organs, organ systems, organisms
Answer:
some examples are in a lake, all the stray cats in a city, or all the evergreen trees in a forest. Remember, limiting factors can affect the carrying capacity. Different limiting factors, such as natural disasters or competition, can cause a population size to decrease!
You can also find photosynthesis, the carbon cycle, the water cycle and others
Wind is considered an abiotic factor because it is not a living organism.
Hope this helps!